星载光纤Bragg光栅传感解调系统研究
发布时间：2019-01-18 21:46
【摘要】：光纤Bragg光栅(Fiber Bragg grating,FBG)因其体积小、质量轻、不受电磁干扰、耐腐蚀、复用能力强、易于组网等优点,非常适用于航天器结构健康监测领域。本文针对星载应用环境高精度大容量传感监测的实际要求,开展了光纤Bragg光栅传感解调系统的研究。分析了空间环境给光纤传感解调系统带来的挑战,提出了基于复合波长参考的温度稳定光纤Bragg光栅传感解调方法,研制了用于星载的传感解调系统,进行了真空下解调系统的高低温循环实验研究,完成工作如下:1)研制了用于星载环境下的多通道并行光纤Bragg光栅解调系统,在对空间环境特点分析的基础上,完成了传感解调系统的总体设计,适用于星载的高功率快速窄带扫描光源、多通道并行探测光路和波长参考光路的设计,一体化的可调谐滤波器驱动电路、电源电路和光电探测电路设计。系统波长扫描范围覆盖1525nm~1565nm,扫描速度400Hz。2)研究了传感解调系统的波长校正方法,针对航天应用环境对解调系统提出的宽温适应能力要求和快速解调要求,在对F-P标准具和乙炔(C2H2)气室温度特性分析的基础上,提出了基于复合波长参考的温度稳定传感解调方法,使用C2H2气室最强吸收谱线结合F-P标准具不同干涉级次进行差别补偿;在对F-P标准具和C2H2气室波长校正算法分析的基础上,进行了快速解调软件设计。3)实验研究了星载光纤Bragg光栅传感解调系统在温度循环和真空热环境中的性能,实验结果显示解调系统在0~55℃范围内,波长解调稳定,解调结果变化幅度为±1.2pm,标准差0.39pm;解调系统在高真空、温度范围-30℃~50℃的环境中,实现了有效的温度传感解调。
[Abstract]:Fiber Bragg grating (Fiber Bragg grating,FBG) is suitable for spacecraft structure health monitoring because of its advantages such as small volume, light weight, no electromagnetic interference, corrosion resistance, strong reusability and easy networking. In order to meet the practical requirements of high precision and large capacity sensing monitoring in spaceborne application environment, the research of fiber Bragg grating sensing and demodulation system is carried out in this paper. In this paper, the challenges brought by the space environment to the fiber optic sensing demodulation system are analyzed, and a temperature-stabilized fiber Bragg grating sensing demodulation method based on complex wavelength reference is proposed, and a spaceborne sensing demodulation system is developed. The experiments of high and low temperature cycle of demodulation system in vacuum are carried out. The work is as follows: 1) A multichannel parallel fiber Bragg grating demodulation system for spaceborne environment is developed. Based on the analysis of the space environment, The overall design of sensor demodulation system is completed, which is suitable for spaceborne high power fast narrow band scanning light source, multi-channel parallel detection optical path and wavelength reference optical path, and integrated tunable filter driving circuit. Power circuit and photoelectric detection circuit design. The wavelength scanning range of the system covers 1525nm / s and the scanning speed 400Hz.2) has studied the wavelength correction method of the sensing demodulation system. Aiming at the requirement of wide temperature adaptability and fast demodulation of the demodulation system proposed by the space application environment, Based on the analysis of temperature characteristics of F-P standard and acetylene (C2H2) chamber, a temperature stable sensing demodulation method based on complex wavelength reference is proposed. The strongest absorption spectrum line of C2H2 chamber and F-P standard were used to compensate for the difference of interference order. Based on the analysis of F-P standard and C2H2 chamber wavelength correction algorithm, a fast demodulation software is designed. 3) the performance of spaceborne fiber Bragg grating sensing demodulation system in temperature cycle and vacuum thermal environment is studied experimentally. The experimental results show that the demodulation system is stable in the range of 0 ~ 55 鈩，
本文编号：2411158
[Abstract]:Fiber Bragg grating (Fiber Bragg grating,FBG) is suitable for spacecraft structure health monitoring because of its advantages such as small volume, light weight, no electromagnetic interference, corrosion resistance, strong reusability and easy networking. In order to meet the practical requirements of high precision and large capacity sensing monitoring in spaceborne application environment, the research of fiber Bragg grating sensing and demodulation system is carried out in this paper. In this paper, the challenges brought by the space environment to the fiber optic sensing demodulation system are analyzed, and a temperature-stabilized fiber Bragg grating sensing demodulation method based on complex wavelength reference is proposed, and a spaceborne sensing demodulation system is developed. The experiments of high and low temperature cycle of demodulation system in vacuum are carried out. The work is as follows: 1) A multichannel parallel fiber Bragg grating demodulation system for spaceborne environment is developed. Based on the analysis of the space environment, The overall design of sensor demodulation system is completed, which is suitable for spaceborne high power fast narrow band scanning light source, multi-channel parallel detection optical path and wavelength reference optical path, and integrated tunable filter driving circuit. Power circuit and photoelectric detection circuit design. The wavelength scanning range of the system covers 1525nm / s and the scanning speed 400Hz.2) has studied the wavelength correction method of the sensing demodulation system. Aiming at the requirement of wide temperature adaptability and fast demodulation of the demodulation system proposed by the space application environment, Based on the analysis of temperature characteristics of F-P standard and acetylene (C2H2) chamber, a temperature stable sensing demodulation method based on complex wavelength reference is proposed. The strongest absorption spectrum line of C2H2 chamber and F-P standard were used to compensate for the difference of interference order. Based on the analysis of F-P standard and C2H2 chamber wavelength correction algorithm, a fast demodulation software is designed. 3) the performance of spaceborne fiber Bragg grating sensing demodulation system in temperature cycle and vacuum thermal environment is studied experimentally. The experimental results show that the demodulation system is stable in the range of 0 ~ 55 鈩，
本文编号：2411158
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